MK 67 Submarine Launched Mobile Mine (SLMM)

Mine Mk 67 is a multiple-influence bottom
mine with a capability that permits it to be
covertly propelled to a predetermined planting
location. Launched by submarine, its purpose is to restrict ship and submarine
traffic.
The MK 67 Submarine-Laid Mobile Mine (SLMM) anti-shipping mine is similar to a torpedo in that after it is launched it can travel under its own power to a remote location. The 1,765-pound MK-67 bottom mine uses a propeller which allows it to move independently into an area not normally accessible by mines.
The Mk 67 employs a modified Torpedo Mk
37 as the propulsion vehicle, designated Mine
Body Main Assembly Mk 4. Forward of this
section is attached Explosive Section Mk 13,
which contains the exploder and arming
device, firing mechanism or target detecting
device and associated battery as well as the
main explosive charge.

The Mk 67 is the only mine
in the US Navy stockpile
that can be clandestinely
delivered from long
standoff ranges.
The 1950's technology in
SLMM is approaching
obsolescence. An
Improved SLMM program
has been
proposed to replace the Mk 67 by converting Mk 48 torpedoes into dual warhead mobile mines.